public class Jsrc16 {
    public static void main(String[] args) {
        // class field, static field, instance field
        // instance method
        // class static method
        // construtor methods
        // overload of method

        // block, static block
        // 静态代码快是类加载就执行, run once
        // 代码块是构造对象前执行
    }
}
